Funnel attachment for paint cans



FIG. 1 is a front elevational view of a funnel attachment for paint cans showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a bottom plan view thereof. 

The ornamental design for a funnel attachment for paint cans, as shown as described. 